Just curious if this has been a common or known problem, but there is a constant rattle coming from the rear passenger interior panel / sub enclosure. I don't have anyone to drive so I can sit back there, so this could very well be coming from the suspension or underneath the car. It only happens when I'm traveling at speeds greater than 60 mph. It sounds like a plastic against aluminum / metal sound, higher pitched and constant.

After looking underneath the car and the suspension, I'm not seeing anything that looks like it could produce the rattle. Could be the suspension, but figure I'd hear it at lower speeds as well. Could be the speaker enclosure, any known rattles coming from this panel?

I seem to get a rattle from somewhere in the rear cargo area but have not been able to pinpoint it yet. But this sounds different. Of course the wheels shake is back on spreads above 60 mph once again.